Is she teething?
It took mine a day or two to tear into them, but once they get the hang of them, there's absolutely no stopping them.
It wouldn't hurt to score the skin with a very sharp knife so she can grab little bits with her front teeth & teeze/pull it.
I still deeply score drumsticks when I feed them, skin & meat.
If she's teething she may also be too sore to crunch bones right now.